Ok, so I was thinking about audio, and I came across the RODE VideoMic. You can read about it here: http://usa.rodemic.com/microphone.php?product=VideoMic
It seems to be a very high quality microphone, with a windscreen included, and it is on the market for $149.
I am willing to chip in to get this microphone for the documentary. If we can get enough people to chip in, we wouldn't have to pay too much each. When we're done with it, we could either sell it again on ebay, or save it for future parkour video projects.
So, can I get a count of how many people would be willing to chip in $10-25$ to get this microphone?